摘要
提出一种新的非迭代查找表预失真方法,该方法采用改进型的查找表预失真器,根据输入的同相和正交(IQ)信号及查找表的值,经过乘加运算后就可直接得到预失真处理后的IQ两路输出,避免了坐标转换所带来的附加计算,使预失真器的结构更简单,计算量更低,并结合单路反馈技术,降低了预失真系统硬件成本。仿真结果证明:该方法是正确的,能很好的抑制带内和带外失真,达到了比较好的预失真线性化效果。
A new non-iterative look-up table predistortion method is presented, it uses the improved look-up table predistorter, and according to the in-phase and quadrature （IQ） input signals and values of the look-up tables, the predistortion IQ output can be obtained directly after multiplication and addition operations, which can avoid additional computation caused by coordinate transformation, making the predistortion structure simpler and less computation. The combination of single- feedback technique reduces the hardware costs. Simulation results show the correctness of the proposed method, which can suppress in-band and out-of-band dis- tortion, and achieve satisfactory linearization performance.
出处
《电波科学学报》
EI
CSCD
北大核心
2011年第1期186-192,共7页
Chinese Journal of Radio Science
基金
国家自然科学基金(60672029)
关键词
非迭代
单路反馈
预失真
非线性
功率放大器
non-iterative
single-feedback
predistortion
nonlinearity
power am-plifier
